Develop Reference

Access camera in android WebView to stream on agora

I am developing a web app which I would now like to make an android app for. For testing, a simple WebView is enough.
Now the issue is that whenever a regular desktop web browser asks for camera and microphone permissions, the app does nothing. It doesn't crash but it also doesn't join the stream.
What do I have to do in order to fix this?
So far, I have the following Code:
AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.techadvice">
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.CAMERA"></uses-permission>
<uses-permission android:name="android.webkit.PermissionRequest" />
<uses-feature android:name="android.hardware.camera"/>
<application
android:usesCleartextTraffic="true"
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
MainActivity.java:
package com.example.techadvice;
import androidx.appcompat.app.AppCompatActivity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class MainActivity extends AppCompatActivity {
private WebView myWebView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myWebView=(WebView) findViewById(R.id.webview);
WebSettings webSettings=myWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setAllowFileAccessFromFileURLs(true);
webSettings.setAllowUniversalAccessFromFileURLs(true);
myWebView.getSettings().setCacheMode(webSettings.LOAD_NO_CACHE);
myWebView.setWebViewClient(new WebViewClient());
myWebView.loadUrl("%some url%");
}
public class mywebClient extends WebViewClient{
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon){
super.onPageStarted(view,url,favicon);
}
#Override
public boolean shouldOverrideUrlLoading(WebView view,String url){
view.loadUrl(url);
return true;
}
}
#Override
public void onBackPressed(){
if(myWebView.canGoBack()) {
myWebView.goBack();
}
else{
super.onBackPressed();
}
}
}
I was mostly following this tutorial: https://youtu.be/2cWbepS1NZM
Thanks in advance!

In your onCreate you can check for permission and request it if the permission hasn't been granted already. You can try something like this:
int MY_PERMISSIONS_REQUEST_CAMERA = 0;
if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA, Manifest.permission.RECORD_AUDIO}, MY_PERMISSIONS_REQUEST_CAMERA);
}

Select Image from Gallery Not Posting to App in Android Studio?

I am really new and been looking through a few tutorials on Android Studio to get some help to make a simple imageview that just picks an image from gallery and displays it on the page. I can get it click and pull up gallery but it wont display after choosing the image from gallery. I looked over a few tutorials and I dont see anything I am missing? Any help?
android manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="adamnate.ddproject" >
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme" >
<activity android:name=".MainActivity" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission a
ndroid:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
MainActivity.xml
package adamnate.ddproject;
import android.content.Intent;
import android.net.Uri;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
public class MainActivity extends AppCompatActivity {
private static final int RESULT_LOAD_IMAGE = 1;
ImageView imageToUpload;
Button bUploadImage;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageToUpload = (ImageView) findViewById(R.id.imageToUpload);
bUploadImage = (Button) findViewById(R.id.bUploadImage);
imageToUpload.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Picture"), 1);
}
});
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK) {
if (requestCode ==11)
imageToUpload.setImageURI(data.getData());
}
}
}
activity_main
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:padding="10dp"
android:layout_height="match_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="150dp"
android:layout_height="150dp"
android:id="#+id/imageToUpload"
android:layout_gravity="center_horizontal" />
<Button
android:id="#+id/bUploadImage"
android:text="Upload Image"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
</ScrollView>

Use this
requestCode == 1
and not
requestCode == 11
because you put 1 on the requestCode param when you call startActivityForResult()

Intent to open url results in wrong url on browser

I am trying to open a URL in a browser using an intent.
My code is
Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.onair99.com"));
startActivity(i);
This will result in an error on any browser I have tried since the browser tries to open something like this:
http://http//onair99.com//
As far as I have tried, I only have encountered the problem with this specific URL.
Does anybody know why?
Thanks.

do as mentioned in this post
String url = "http://www.somewebsite.com";
In production level code, you may like to check if the url begins with http or https... Would be better to check
if (!url.startsWith("http://") && !url.startsWith("https://"))
url = "http://" + url;
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse(url));
startActivity(i);
Here's the documentation of Intent.ACTION_VIEW.

Try This Code
main.xml
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" Go to link" />
</LinearLayout>
MyAndroidAppActivity.java
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.widget.Button;
import android.view.View;
import android.view.View.OnClickListener;
public class MyAndroidAppActivity extends Activity {
Button button;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
addListenerOnButton();
}
public void addListenerOnButton() {
button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.onair99.com"));
startActivity(browserIntent);
}
});
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mkyong.android"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="10" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name" >
<activity
android:label="#string/app_name"
android:name=".MyAndroidAppActivity" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

Zbar integration into Android app

I am using the Android ADT Bundle for dev work. After reading multiple guides online I have added the package com.dm.zbar.android.scanner to my project. I have included the files CameraPreview.java, ZBarConstants.java, and ZBarScannerActivity.java in the package. Despite all this the ZBAR_SCANNER_REQUEST var in the class ScanActivity.java (created by me, but using zbar methods) cannot be resolved to a variable. Everything except this variable is accepted. Any idea why this is occurring? Note: My libs folder contains everything in here:
https://github.com/DushyanthMaguluru/ZBarScanner/tree/master/ZBarScannerLibrary/libs
and zbar.jar is included on the build path.
ScanActivity:
package com.xx.xxx;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.view.Menu;
import android.view.View;
import android.widget.Toast;
import com.dm.zbar.android.scanner.ZBarConstants;
import com.dm.zbar.android.scanner.ZBarScannerActivity;
import net.sourceforge.zbar.Symbol;
public class ScanActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_scan);
}
public void launchScanner(View v) {
if (isCameraAvailable()) {
Intent intent = new Intent(this, ZBarScannerActivity.class);
startActivityForResult(intent, ZBAR_SCANNER_REQUEST);
} else {
Toast.makeText(this, "Rear Facing Camera Unavailable", Toast.LENGTH_SHORT).show();
}
}
public void launchQRScanner(View v) {
if (isCameraAvailable()) {
Intent intent = new Intent(this, ZBarScannerActivity.class);
intent.putExtra(ZBarConstants.SCAN_MODES, new int[]{Symbol.QRCODE});
startActivityForResult(intent, ZBAR_SCANNER_REQUEST);
} else {
Toast.makeText(this, "Rear Facing Camera Unavailable", Toast.LENGTH_SHORT).show();
}
}
public boolean isCameraAvailable() {
PackageManager pm = getPackageManager();
return pm.hasSystemFeature(PackageManager.FEATURE_CAMERA);
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case ZBAR_SCANNER_REQUEST:
case ZBAR_QR_SCANNER_REQUEST:
if (resultCode == RESULT_OK) {
Toast.makeText(this, "Scan Result = " + data.getStringExtra(ZBarConstants.SCAN_RESULT), Toast.LENGTH_SHORT).show();
}
break;
}
}
}
Just in case it is relevant:
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.xx.xxx"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature
android:name="android.hardware.camera"
android:required="false" />
<application
android:icon="#drawable/ic_launcher"
android:label="xx"
android:theme="#style/AppTheme" >
<activity android:name="com.xx.xxx.MainActivity" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="com.xx.xxx.WvActivity" />
<activity android:name="com.xx.xxx.ScanActivity" />
<activity
android:name="com.dm.zbar.android.scanner.ZBarScannerActivity"
android:screenOrientation="landscape" />
</application>

I checked the ZBar Library Example. You made a mistake.
This error occurred because you did not declare these two variables in your activity
private static final int ZBAR_SCANNER_REQUEST = 0;
private static final int ZBAR_QR_SCANNER_REQUEST = 1;
you need to declare these variables above your onCreate(..) Method.
See the ZBar Example.

Android Barcode Scanner

I am using Biggu barcode library.
Packaged library has been listed everything using demo and sample application.
But I am getting no class definition found error
java.lang.NoClassDefFoundError: com.biggu.scannerdemo.ScannerActivity
But the class is in package and manifest file lists all the activities.
Build path has biggu_scanner-1.1.0.jar file in its path.
package com.biggu.scannerdemo;
import com.biggu.barcodescanner.client.android.Intents;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class Demo extends Activity {
private static final int SCANNER_REQUEST_CODE = 0;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button button = (Button)findViewById(R.id.btn);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(v.getContext(), com.biggu.scannerdemo.ScannerActivity.class);
intent.putExtra(Intents.Preferences.ENABLE_BEEP, true);
intent.putExtra(Intents.Preferences.ENABLE_VIBRATE, true);
((Activity)v.getContext()).startActivityForResult(intent, SCANNER_REQUEST_CODE);
}
});
}
#Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == Activity.RESULT_OK && requestCode == SCANNER_REQUEST_CODE) {
Bundle extras = data.getExtras();
String result = extras.getString("SCAN_RESULT");
TextView textView = (TextView)findViewById(R.id.txt);
textView.setText(result);
}
}}
ScannerActivity is having the below code
package com.biggu.scannerdemo;
import com.biggu.barcodescanner.client.android.CaptureActivity;
public class ScannerActivity extends CaptureActivity {
#Override
public int get_R_id_preview_view() {
return R.id.preview_view;
}
#Override
public int get_R_id_viewfinder_view() {
return R.id.viewfinder_view;
}
#Override
public int get_R_layout_scanner() {
return R.layout.scanner;
}
#Override
public int get_R_raw_beep() {
return R.raw.beep;
}
}
Android manifest file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.biggu.scannerdemo"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="#drawable/icon" android:label="#string/app_name">
<activity android:name=".Demo"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".ScannerActivity"
android:label="Scanner Activity" android:screenOrientation="landscape"
android:configChanges="orientation|keyboardHidden" android:theme="#android:style/Theme.NoTitleBar.Fullscreen">
</activity>
</application>
<uses-sdk android:minSdkVersion="4" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.FLASHLIGHT" />
Tried everything to set right
Could anyone let me know what could be the wrong in the code.
Looking forward to your reply.thanks.

You must make sure that your lib is exported when building the APK.
In Project properties > Java Build Path > Order and Export => check your lib

You need to add the library in the project preferences.